about summary refs log tree commit diff
path: root/src/libstore/remote-store.cc
blob: bcae21bf76509738152c1fb43041c531db3b7805 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
#include "serialise.hh"
#include "util.hh"
#include "remote-store.hh"
#include "worker-protocol.hh"
#include "archive.hh"

#include <iostream>
#include <unistd.h>


namespace nix {


RemoteStore::RemoteStore()
{
    toChild.create();
    fromChild.create();


    /* Start the worker. */
    string worker = "nix-worker";

    child = fork();
    
    switch (child) {
        
    case -1:
        throw SysError("unable to fork");

    case 0:
        try { /* child */

            fromChild.readSide.close();
            if (dup2(fromChild.writeSide, STDOUT_FILENO) == -1)
                throw SysError("dupping write side");

            toChild.writeSide.close();
            if (dup2(toChild.readSide, STDIN_FILENO) == -1)
                throw SysError("dupping read side");

            execlp(worker.c_str(), worker.c_str(),
                "--slave", NULL);
            
            throw SysError(format("executing `%1%'") % worker);
            
        } catch (std::exception & e) {
            std::cerr << format("child error: %1%\n") % e.what();
        }
        quickExit(1);
    }

    fromChild.writeSide.close();
    toChild.readSide.close();

    from.fd = fromChild.readSide;
    to.fd = toChild.writeSide;

    
    /* Send the magic greeting, check for the reply. */
    writeInt(WORKER_MAGIC_1, to);
    
    unsigned int magic = readInt(from);
    if (magic != WORKER_MAGIC_2) throw Error("protocol mismatch");
}


RemoteStore::~RemoteStore()
{
    writeInt(wopQuit, to);
    readInt(from);
    child.wait(true);
}


bool RemoteStore::isValidPath(const Path & path)
{
    writeInt(wopIsValidPath, to);
    writeString(path, to);
    unsigned int reply = readInt(from);
    return reply != 0;
}


Substitutes RemoteStore::querySubstitutes(const Path & path)
{
    throw Error("not implemented 2");
}


bool RemoteStore::hasSubstitutes(const Path & path)
{
    writeInt(wopHasSubstitutes, to);
    writeString(path, to);
    unsigned int reply = readInt(from);
    return reply != 0;
}


Hash RemoteStore::queryPathHash(const Path & path)
{
    throw Error("not implemented 3");
}


void RemoteStore::queryReferences(const Path & path,
    PathSet & references)
{
    writeInt(wopQueryReferences, to);
    writeString(path, to);
    PathSet references2 = readStringSet(from);
    references.insert(references2.begin(), references2.end());
}


void RemoteStore::queryReferrers(const Path & path,
    PathSet & referrers)
{
    writeInt(wopQueryReferrers, to);
    writeString(path, to);
    PathSet referrers2 = readStringSet(from);
    referrers.insert(referrers2.begin(), referrers2.end());
}


Path RemoteStore::addToStore(const Path & _srcPath, bool fixed,
    bool recursive, string hashAlgo)
{
    Path srcPath(absPath(_srcPath));
    
    writeInt(wopAddToStore, to);
    writeString(baseNameOf(srcPath), to);
    writeInt(fixed ? 1 : 0, to);
    writeInt(recursive ? 1 : 0, to);
    writeString(hashAlgo, to);
    dumpPath(srcPath, to);
    Path path = readString(from);
    return path;
}


Path RemoteStore::addTextToStore(const string & suffix, const string & s,
    const PathSet & references)
{
    writeInt(wopAddTextToStore, to);
    writeString(suffix, to);
    writeString(s, to);
    writeStringSet(references, to);
    
    Path path = readString(from);
    return path;
}


void RemoteStore::buildDerivations(const PathSet & drvPaths)
{
    writeInt(wopBuildDerivations, to);
    writeStringSet(drvPaths, to);
    readInt(from);
}


void RemoteStore::ensurePath(const Path & path)
{
    writeInt(wopEnsurePath, to);
    writeString(path, to);
    readInt(from);
}


}